package com.sky.controller.admin;

import com.sky.result.Result;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

@Slf4j
@RestController
@RequestMapping("/admin/common")
@Api(tags = "文件上传相关")
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;
    /**
     * 文件上传
     * @param file 参数有要求
     * @return
     */
    @PostMapping("/upload")
    public Result<String> upload(MultipartFile file){

        //file是一个临时文件，需要转存到指定位置，否则本次请求完成后临时文件会删除
        log.info(file.toString());

//        //创建一个目录对象
//        File dir = new File(basePath);
//        //判断当前目录是否存在
//        if(!dir.exists()){
//            //目录不存在
//            dir.mkdirs();
//        }

        try {
            //将临时文件转存到指定位置
            //原始文件名
            String originalFilename = file.getOriginalFilename();
            String suffix=originalFilename.substring(originalFilename.lastIndexOf("."));

            //使用UUID重新生成文件名，防止文件名重复造成重复覆盖
            String fileName = UUID.randomUUID().toString()+suffix;
            file.transferTo(new File(basePath+fileName));
            String filePath = "http://localhost:8081/myapps/img/"+fileName;
            return Result.success(filePath);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        try {
            //输入流，通过输入流读取文件内容
            FileInputStream fileInputStream = new FileInputStream(new File(basePath+name));

            //输出流，通过输出流将文件写回浏览器，在浏览器展示图片了
            ServletOutputStream outputStream = response.getOutputStream();

            response.setContentType("image/jpeg");

            int len=0;
            byte[] bytes = new byte[1024];
            while ((len=fileInputStream.read(bytes))!=-1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
            //关闭资源
            outputStream.close();
            fileInputStream.close();

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
